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|
/* $OpenBSD: parse.y,v 1.6 2005/07/07 22:00:36 hshoexer Exp $ */
/*
* Copyright (c) 2002, 2003, 2004 Henning Brauer <henning@openbsd.org>
* Copyright (c) 2001 Markus Friedl. All rights reserved.
* Copyright (c) 2001 Daniel Hartmeier. All rights reserved.
* Copyright (c) 2001 Theo de Raadt. All rights reserved.
* Copyright (c) 2004, 2005 Hans-Joerg Hoexer <hshoexer@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
%{
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <limits.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include <syslog.h>
#include "ipsecctl.h"
static struct ipsecctl *ipsec = NULL;
static FILE *fin = NULL;
static int lineno = 1;
static int errors = 0;
static int debug = 0;
int yyerror(const char *, ...);
int yyparse(void);
int kw_cmp(const void *, const void *);
int lookup(char *);
int lgetc(FILE *);
int lungetc(int);
int findeol(void);
int yylex(void);
TAILQ_HEAD(symhead, sym) symhead = TAILQ_HEAD_INITIALIZER(symhead);
struct sym {
TAILQ_ENTRY(sym) entries;
int used;
int persist;
char *nam;
char *val;
};
int symset(const char *, const char *, int);
int cmdline_symset(char *);
char *symget(const char *);
int atoul(char *, u_long *);
struct ipsec_addr *host(const char *);
struct ipsec_addr *copyhost(const struct ipsec_addr *);
struct ipsec_rule *create_rule(u_int8_t, struct ipsec_addr *, struct
ipsec_addr *, struct ipsec_addr *, u_int8_t,
char *, char *, u_int16_t);
struct ipsec_rule *reverse_rule(struct ipsec_rule *);
typedef struct {
union {
u_int32_t number;
u_int8_t dir;
char *string;
int log;
u_int8_t protocol;
struct {
struct ipsec_addr *src;
struct ipsec_addr *dst;
} hosts;
struct ipsec_addr *peer;
struct ipsec_addr *host;
struct {
char *srcid;
char *dstid;
} ids;
char *id;
u_int16_t authtype;
} v;
int lineno;
} YYSTYPE;
%}
%token FLOW FROM ESP AH IN PEER ON OUT TO SRCID DSTID RSA PSK
%token ERROR
%token <v.string> STRING
%type <v.dir> dir
%type <v.protocol> protocol
%type <v.number> number
%type <v.hosts> hosts
%type <v.peer> peer
%type <v.host> host
%type <v.ids> ids
%type <v.id> id
%type <v.authtype> authtype
%%
grammar : /* empty */
| grammar '\n'
| grammar flowrule '\n'
| grammar error '\n' { errors++; }
;
number : STRING {
unsigned long ulval;
if (atoul($1, &ulval) == -1) {
yyerror("%s is not a number", $1);
free($1);
YYERROR;
} else
$$ = ulval;
free($1);
}
flowrule : FLOW ipsecrule { }
;
ipsecrule : protocol dir hosts peer ids authtype {
struct ipsec_rule *r;
r = create_rule($2, $3.src, $3.dst, $4, $1, $5.srcid,
$5.dstid, $6);
if (r == NULL)
YYERROR;
r->nr = ipsec->rule_nr++;
if (ipsecctl_add_rule(ipsec, r))
errx(1, "esprule: ipsecctl_add_rule");
/* Create and add reverse rule. */
if ($2 == IPSEC_INOUT) {
r = reverse_rule(r);
r->nr = ipsec->rule_nr++;
if (ipsecctl_add_rule(ipsec, r))
errx(1, "esprule: ipsecctl_add_rule");
}
}
;
protocol : /* empty */ { $$ = IPSEC_ESP; }
| ESP { $$ = IPSEC_ESP; }
| AH { $$ = IPSEC_AH; }
;
dir : /* empty */ { $$ = IPSEC_INOUT; }
| IN { $$ = IPSEC_IN; }
| OUT { $$ = IPSEC_OUT; }
;
hosts : FROM host TO host {
$$.src = $2;
$$.dst = $4;
}
;
peer : /* empty */ { $$ = NULL; }
| PEER STRING {
if (($$ = host($2)) == NULL) {
free($2);
yyerror("could not parse host specification");
YYERROR;
}
free($2);
}
;
host : STRING {
if (($$ = host($1)) == NULL) {
free($1);
yyerror("could not parse host specification");
YYERROR;
}
free($1);
}
| STRING '/' number {
char *buf;
if (asprintf(&buf, "%s/%u", $1, $3) == -1)
err(1, "host: asprintf");
free($1);
if (($$ = host(buf)) == NULL) {
free(buf);
yyerror("could not parse host specification");
YYERROR;
}
free(buf);
}
;
ids : /* empty */ {
$$.srcid = NULL;
$$.dstid = NULL;
}
| SRCID id DSTID id {
$$.srcid = $2;
$$.dstid = $4;
}
| SRCID id {
$$.srcid = $2;
$$.dstid = NULL;
}
| DSTID id {
$$.srcid = NULL;
$$.dstid = $2;
}
;
id : STRING { $$ = $1; }
;
authtype : /* empty */ { $$ = 0; }
| RSA { $$ = AUTH_RSA; }
| PSK { $$ = AUTH_PSK; }
;
%%
struct keywords {
const char *k_name;
int k_val;
};
int
yyerror(const char *fmt, ...)
{
va_list ap;
extern char *infile;
errors = 1;
va_start(ap, fmt);
fprintf(stderr, "%s: %d: ", infile, yyval.lineno);
vfprintf(stderr, fmt, ap);
fprintf(stderr, "\n");
va_end(ap);
return (0);
}
int
kw_cmp(const void *k, const void *e)
{
return (strcmp(k, ((const struct keywords *)e)->k_name));
}
int
lookup(char *s)
{
/* this has to be sorted always */
static const struct keywords keywords[] = {
{ "ah", AH},
{ "dstid", DSTID},
{ "esp", ESP},
{ "flow", FLOW},
{ "from", FROM},
{ "in", IN},
{ "out", OUT},
{ "peer", PEER},
{ "psk", PSK},
{ "rsa", RSA},
{ "srcid", SRCID},
{ "to", TO},
};
const struct keywords *p;
p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
sizeof(keywords[0]), kw_cmp);
if (p) {
if (debug > 1)
fprintf(stderr, "%s: %d\n", s, p->k_val);
return (p->k_val);
} else {
if (debug > 1)
fprintf(stderr, "string: %s\n", s);
return (STRING);
}
}
#define MAXPUSHBACK 128
char *parsebuf;
int parseindex;
char pushback_buffer[MAXPUSHBACK];
int pushback_index = 0;
int
lgetc(FILE *f)
{
int c, next;
if (parsebuf) {
/* Read character from the parsebuffer instead of input. */
if (parseindex >= 0) {
c = parsebuf[parseindex++];
if (c != '\0')
return (c);
parsebuf = NULL;
} else
parseindex++;
}
if (pushback_index)
return (pushback_buffer[--pushback_index]);
while ((c = getc(f)) == '\\') {
next = getc(f);
if (next != '\n') {
if (isspace(next))
yyerror("whitespace after \\");
ungetc(next, f);
break;
}
yylval.lineno = lineno;
lineno++;
}
if (c == '\t' || c == ' ') {
/* Compress blanks to a single space. */
do {
c = getc(f);
} while (c == '\t' || c == ' ');
ungetc(c, f);
c = ' ';
}
return (c);
}
int
lungetc(int c)
{
if (c == EOF)
return (EOF);
if (parsebuf) {
parseindex--;
if (parseindex >= 0)
return (c);
}
if (pushback_index < MAXPUSHBACK-1)
return (pushback_buffer[pushback_index++] = c);
else
return (EOF);
}
int
findeol(void)
{
int c;
parsebuf = NULL;
pushback_index = 0;
/* skip to either EOF or the first real EOL */
while (1) {
c = lgetc(fin);
if (c == '\n') {
lineno++;
break;
}
if (c == EOF)
break;
}
return (ERROR);
}
int
yylex(void)
{
char buf[8096];
char *p, *val;
int endc, c;
int token;
top:
p = buf;
while ((c = lgetc(fin)) == ' ')
; /* nothing */
yylval.lineno = lineno;
if (c == '#')
while ((c = lgetc(fin)) != '\n' && c != EOF)
; /* nothing */
if (c == '$' && parsebuf == NULL) {
while (1) {
if ((c = lgetc(fin)) == EOF)
return (0);
if (p + 1 >= buf + sizeof(buf) - 1) {
yyerror("string too long");
return (findeol());
}
if (isalnum(c) || c == '_') {
*p++ = (char)c;
continue;
}
*p = '\0';
lungetc(c);
break;
}
val = symget(buf);
if (val == NULL) {
yyerror("macro \"%s\" not defined", buf);
return (findeol());
}
parsebuf = val;
parseindex = 0;
goto top;
}
switch (c) {
case '\'':
case '"':
endc = c;
while (1) {
if ((c = lgetc(fin)) == EOF)
return (0);
if (c == endc) {
*p = '\0';
break;
}
if (c == '\n') {
lineno++;
continue;
}
if (p + 1 >= buf + sizeof(buf) - 1) {
yyerror("string too long");
return (findeol());
}
*p++ = (char)c;
}
yylval.v.string = strdup(buf);
if (yylval.v.string == NULL)
err(1, "yylex: strdup");
return (STRING);
}
#define allowed_in_string(x) \
(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
x != '{' && x != '}' && x != '<' && x != '>' && \
x != '!' && x != '=' && x != '/' && x != '#' && \
x != ','))
if (isalnum(c) || c == ':' || c == '_' || c == '*') {
do {
*p++ = c;
if ((unsigned)(p-buf) >= sizeof(buf)) {
yyerror("string too long");
return (findeol());
}
} while ((c = lgetc(fin)) != EOF && (allowed_in_string(c)));
lungetc(c);
*p = '\0';
if ((token = lookup(buf)) == STRING)
if ((yylval.v.string = strdup(buf)) == NULL)
err(1, "yylex: strdup");
return (token);
}
if (c == '\n') {
yylval.lineno = lineno;
lineno++;
}
if (c == EOF)
return (0);
return (c);
}
int
parse_rules(FILE *input, struct ipsecctl *ipsecx)
{
struct sym *sym, *next;
ipsec = ipsecx;
fin = input;
lineno = 1;
errors = 0;
yyparse();
/* Free macros and check which have not been used. */
for (sym = TAILQ_FIRST(&symhead); sym != NULL; sym = next) {
next = TAILQ_NEXT(sym, entries);
free(sym->nam);
free(sym->val);
TAILQ_REMOVE(&symhead, sym, entries);
free(sym);
}
return (errors ? -1 : 0);
}
int
symset(const char *nam, const char *val, int persist)
{
struct sym *sym;
for (sym = TAILQ_FIRST(&symhead); sym && strcmp(nam, sym->nam);
sym = TAILQ_NEXT(sym, entries))
; /* nothing */
if (sym != NULL) {
if (sym->persist == 1)
return (0);
else {
free(sym->nam);
free(sym->val);
TAILQ_REMOVE(&symhead, sym, entries);
free(sym);
}
}
if ((sym = calloc(1, sizeof(*sym))) == NULL)
return (-1);
sym->nam = strdup(nam);
if (sym->nam == NULL) {
free(sym);
return (-1);
}
sym->val = strdup(val);
if (sym->val == NULL) {
free(sym->nam);
free(sym);
return (-1);
}
sym->used = 0;
sym->persist = persist;
TAILQ_INSERT_TAIL(&symhead, sym, entries);
return (0);
}
int
cmdline_symset(char *s)
{
char *sym, *val;
int ret;
size_t len;
if ((val = strrchr(s, '=')) == NULL)
return (-1);
len = strlen(s) - strlen(val) + 1;
if ((sym = malloc(len)) == NULL)
err(1, "cmdline_symset: malloc");
strlcpy(sym, s, len);
ret = symset(sym, val + 1, 1);
free(sym);
return (ret);
}
char *
symget(const char *nam)
{
struct sym *sym;
TAILQ_FOREACH(sym, &symhead, entries)
if (strcmp(nam, sym->nam) == 0) {
sym->used = 1;
return (sym->val);
}
return (NULL);
}
int
atoul(char *s, u_long *ulvalp)
{
u_long ulval;
char *ep;
errno = 0;
ulval = strtoul(s, &ep, 0);
if (s[0] == '\0' || *ep != '\0')
return (-1);
if (errno == ERANGE && ulval == ULONG_MAX)
return (-1);
*ulvalp = ulval;
return (0);
}
struct ipsec_addr *
host(const char *s)
{
struct ipsec_addr *ipa;
int i, bits = 32;
/* XXX for now only AF_INET. */
ipa = calloc(1, sizeof(struct ipsec_addr));
if (ipa == NULL)
err(1, "calloc");
if (strrchr(s, '/') != NULL) {
bits = inet_net_pton(AF_INET, s, &ipa->v4, sizeof(ipa->v4));
if (bits == -1 || bits > 32) {
free(ipa);
return(NULL);
}
} else {
if (inet_pton(AF_INET, s, &ipa->v4) != 1) {
free(ipa);
return NULL;
}
}
bzero(&ipa->v4mask, sizeof(ipa->v4mask));
if (bits == 32) {
ipa->v4mask.mask32 = 0xffffffff;
ipa->netaddress = 0;
} else {
for (i = 31; i > 31 - bits; i--)
ipa->v4mask.mask32 |= (1 << i);
ipa->v4mask.mask32 = htonl(ipa->v4mask.mask32);
ipa->netaddress = 1;
}
ipa->af = AF_INET;
return ipa;
}
struct ipsec_addr *
copyhost(const struct ipsec_addr *src)
{
struct ipsec_addr *dst;
dst = calloc(1, sizeof(struct ipsec_addr));
if (dst == NULL)
err(1, "calloc");
memcpy(dst, src, sizeof(struct ipsec_addr));
return dst;
}
struct ipsec_rule *
create_rule(u_int8_t dir, struct ipsec_addr *src, struct ipsec_addr *dst,
struct ipsec_addr *peer, u_int8_t proto, char *srcid, char *dstid,
u_int16_t authtype)
{
struct ipsec_rule *r;
r = calloc(1, sizeof(struct ipsec_rule));
if (r == NULL)
err(1, "calloc");
r->type = RULE_FLOW;
if (dir == IPSEC_INOUT)
r->direction = IPSEC_OUT;
else
r->direction = dir;
if (r->direction == IPSEC_IN)
r->flowtype = TYPE_USE;
else
r->flowtype = TYPE_REQUIRE;
r->src = src;
r->dst = dst;
if (peer == NULL) {
/* Set peer to remote host. Must be a host address. */
if (r->direction == IPSEC_IN) {
if (r->src->netaddress) {
yyerror("no peer specified");
goto errout;
}
r->peer = copyhost(r->src);
} else {
if (r->dst->netaddress) {
yyerror("no peer specified");
goto errout;
}
r->peer = copyhost(r->dst);
}
} else
r->peer = peer;
r->proto = proto;
r->auth.srcid = srcid;
r->auth.dstid = dstid;
r->auth.idtype = ID_FQDN; /* XXX For now only FQDN. */
#ifdef notyet
r->auth.type = authtype;
#endif
return r;
errout:
free(r);
if (srcid)
free(srcid);
if (dstid)
free(dstid);
free(src);
free(dst);
return NULL;
}
struct ipsec_rule *
reverse_rule(struct ipsec_rule *rule)
{
struct ipsec_rule *reverse;
reverse = calloc(1, sizeof(struct ipsec_rule));
if (reverse == NULL)
err(1, "calloc");
reverse->type = RULE_FLOW;
if (rule->direction == (u_int8_t)IPSEC_OUT) {
reverse->direction = (u_int8_t)IPSEC_IN;
reverse->flowtype = TYPE_USE;
} else {
reverse->direction = (u_int8_t)IPSEC_OUT;
reverse->flowtype = TYPE_REQUIRE;
}
reverse->src = copyhost(rule->dst);
reverse->dst = copyhost(rule->src);
reverse->peer = copyhost(rule->peer);
reverse->proto = (u_int8_t)rule->proto;
if (rule->auth.dstid && (reverse->auth.dstid =
strdup(rule->auth.dstid)) == NULL)
err(1, "strdup");
if (rule->auth.srcid && (reverse->auth.srcid =
strdup(rule->auth.srcid)) == NULL)
err(1, "strdup");
reverse->auth.idtype = rule->auth.idtype;
reverse->auth.type = rule->auth.type;
return reverse;
}
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